Postpartum depression can be a distressing, often confusing, experience for new parents. Part of the issue, as Chrissy Teigen found out after giving birth to her daughter in 2016, is that postpartum depression symptoms don't always come on immediately.

In a new interview with Glamour, Teigen remembers the moment she realized something wasn't quite right—and that it came later than she would have expected.

"I think the most surprising thing for me was that it happened three months after," Teigen says in the interview.

"I thought postpartum was, you have the baby and you’re sad," she continues. "It was like, no. It sneaks up on a lot of people. That’s why I thought it was important for me to talk about." Teigen was apparently dressed as Eleven from Stranger Things as part of her appearance on Lip Sync Battle when she noticed that something was off.

Previously, Teigen said that one of the first subtle signs she picked up on was that her relationship with food had changed. "I started looking at food and was like, 'I'm just not in the mood,' " she told People in September. "It’s like going to the grocery store when you’re full. You just don’t want the same things. Food wasn’t that thrilling for me."

Postpartum depression—and all variations on postpartum mood changes—can be different from person to person.

As SELF wrote previously, the symptoms of postpartum depression can be both mental and physical, including feelings of sadness, hopelessness, irritability, anxiety, and restlessness as well as changes in appetite or sleep habits and fatigue. And although research suggests that the majority of people begin to experience symptoms in the early postpartum period (within six weeks of delivery), about one in five people experience them later on.

But the most important thing, no matter when your symptoms begin, is to recognize them and get help as soon as you can, whether that's from your support network, your doctor, or a mental health professional.